osseous part

例句：

1. 1. The bone structure of the human body is complex and requires careful analysis.
   人体骨骼结构复杂，需要仔细分析。
2. 2. The study of osseous structures has provided insights into the evolution of life on Earth.
   对骨骼结构的研究表明，地球上生命的演化过程。
3. 3. The osseous part of the skull is visible through a small opening in the forehead.
   颅骨的坚硬部分可以通过额头上的一个小孔看到。